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tcp: add const qualifiers where possible
[linux-2.6-block.git] / net / ipv4 / ip_sockglue.c
CommitLineData
1da177e4
LT		 1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * The IP to API glue.
e905a9ed 7 *
1da177e4
LT		 8 * Authors: see ip.c
9 *
10 * Fixes:
11 * Many : Split from ip.c , see ip.c for history.
12 * Martin Mares : TOS setting fixed.
e905a9ed 13 * Alan Cox : Fixed a couple of oopses in Martin's
1da177e4
LT		 14 * TOS tweaks.
15 * Mike McLagan : Routing by source
16 */
17
1da177e4
LT		 18#include <linux/module.h>
19#include <linux/types.h>
20#include <linux/mm.h>
1da177e4
LT		 21#include <linux/skbuff.h>
22#include <linux/ip.h>
23#include <linux/icmp.h>
14c85021 24#include <linux/inetdevice.h>
1da177e4 25#include <linux/netdevice.h>
5a0e3ad6 26#include <linux/slab.h>
1da177e4
LT		 27#include <net/sock.h>
28#include <net/ip.h>
29#include <net/icmp.h>
d83d8461 30#include <net/tcp_states.h>
1da177e4
LT		 31#include <linux/udp.h>
32#include <linux/igmp.h>
33#include <linux/netfilter.h>
34#include <linux/route.h>
35#include <linux/mroute.h>
36#include <net/route.h>
37#include <net/xfrm.h>
dae50295 38#include <net/compat.h>
1da177e4
LT		 39#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
40#include <net/transp_v6.h>
41#endif
42
43#include <linux/errqueue.h>
44#include <asm/uaccess.h>
45
46#define IP_CMSG_PKTINFO 1
47#define IP_CMSG_TTL 2
48#define IP_CMSG_TOS 4
49#define IP_CMSG_RECVOPTS 8
50#define IP_CMSG_RETOPTS 16
2c7946a7 51#define IP_CMSG_PASSSEC 32
e8b2dfe9 52#define IP_CMSG_ORIGDSTADDR 64
1da177e4
LT		 53
54/*
55 * SOL_IP control messages.
56 */
57
58static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
59{
60 struct in_pktinfo info;
511c3f92 61 struct rtable *rt = skb_rtable(skb);
1da177e4 62
eddc9ec5 63 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
1da177e4
LT		 64 if (rt) {
65 info.ipi_ifindex = rt->rt_iif;
66 info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
67 } else {
68 info.ipi_ifindex = 0;
69 info.ipi_spec_dst.s_addr = 0;
70 }
71
72 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
73}
74
75static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
76{
eddc9ec5 77 int ttl = ip_hdr(skb)->ttl;
1da177e4
LT		 78 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
79}
80
81static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
82{
eddc9ec5 83 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
1da177e4
LT		 84}
85
86static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
87{
88 if (IPCB(skb)->opt.optlen == 0)
89 return;
90
eddc9ec5
ACM		 91 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
92 ip_hdr(skb) + 1);
1da177e4
LT		 93}
94
95
96static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
97{
98 unsigned char optbuf[sizeof(struct ip_options) + 40];
09cb105e 99 struct ip_options * opt = (struct ip_options *)optbuf;
1da177e4
LT		 100
101 if (IPCB(skb)->opt.optlen == 0)
102 return;
103
104 if (ip_options_echo(opt, skb)) {
105 msg->msg_flags |= MSG_CTRUNC;
106 return;
107 }
108 ip_options_undo(opt);
109
110 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
111}
112
2c7946a7
CZ		 113static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
114{
115 char *secdata;
dc49c1f9 116 u32 seclen, secid;
2c7946a7
CZ		 117 int err;
118
dc49c1f9
CZ		 119 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
120 if (err)
121 return;
122
123 err = security_secid_to_secctx(secid, &secdata, &seclen);
2c7946a7
CZ		 124 if (err)
125 return;
126
127 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
dc49c1f9 128 security_release_secctx(secdata, seclen);
2c7946a7
CZ		 129}
130
21d1a161 131static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
e8b2dfe9
BS		 132{
133 struct sockaddr_in sin;
b71d1d42 134 const struct iphdr *iph = ip_hdr(skb);
21d1a161 135 __be16 *ports = (__be16 *)skb_transport_header(skb);
e8b2dfe9
BS		 136
137 if (skb_transport_offset(skb) + 4 > skb->len)
138 return;
139
140 /* All current transport protocols have the port numbers in the
141 * first four bytes of the transport header and this function is
142 * written with this assumption in mind.
143 */
144
145 sin.sin_family = AF_INET;
146 sin.sin_addr.s_addr = iph->daddr;
147 sin.sin_port = ports[1];
148 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
149
150 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
151}
1da177e4
LT		 152
153void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
154{
155 struct inet_sock *inet = inet_sk(skb->sk);
156 unsigned flags = inet->cmsg_flags;
157
158 /* Ordered by supposed usage frequency */
159 if (flags & 1)
160 ip_cmsg_recv_pktinfo(msg, skb);
4d52cfbe 161 if ((flags >>= 1) == 0)
1da177e4
LT		 162 return;
163
164 if (flags & 1)
165 ip_cmsg_recv_ttl(msg, skb);
4d52cfbe 166 if ((flags >>= 1) == 0)
1da177e4
LT		 167 return;
168
169 if (flags & 1)
170 ip_cmsg_recv_tos(msg, skb);
4d52cfbe 171 if ((flags >>= 1) == 0)
1da177e4
LT		 172 return;
173
174 if (flags & 1)
175 ip_cmsg_recv_opts(msg, skb);
4d52cfbe 176 if ((flags >>= 1) == 0)
1da177e4
LT		 177 return;
178
179 if (flags & 1)
180 ip_cmsg_recv_retopts(msg, skb);
4d52cfbe 181 if ((flags >>= 1) == 0)
2c7946a7
CZ		 182 return;
183
184 if (flags & 1)
185 ip_cmsg_recv_security(msg, skb);
e8b2dfe9 186
4d52cfbe 187 if ((flags >>= 1) == 0)
e8b2dfe9
BS		 188 return;
189 if (flags & 1)
190 ip_cmsg_recv_dstaddr(msg, skb);
191
1da177e4 192}
4d52cfbe 193EXPORT_SYMBOL(ip_cmsg_recv);
1da177e4 194
7a6adb92 195int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
1da177e4
LT		 196{
197 int err;
198 struct cmsghdr *cmsg;
199
200 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
201 if (!CMSG_OK(msg, cmsg))
202 return -EINVAL;
203 if (cmsg->cmsg_level != SOL_IP)
204 continue;
205 switch (cmsg->cmsg_type) {
206 case IP_RETOPTS:
207 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
4d52cfbe
ED		 208 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
209 err < 40 ? err : 40);
1da177e4
LT		 210 if (err)
211 return err;
212 break;
213 case IP_PKTINFO:
214 {
215 struct in_pktinfo *info;
216 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
217 return -EINVAL;
218 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
219 ipc->oif = info->ipi_ifindex;
220 ipc->addr = info->ipi_spec_dst.s_addr;
221 break;
222 }
223 default:
224 return -EINVAL;
225 }
226 }
227 return 0;
228}
229
230
231/* Special input handler for packets caught by router alert option.
232 They are selected only by protocol field, and then processed likely
233 local ones; but only if someone wants them! Otherwise, router
234 not running rsvpd will kill RSVP.
235
236 It is user level problem, what it will make with them.
237 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
238 but receiver should be enough clever f.e. to forward mtrace requests,
239 sent to multicast group to reach destination designated router.
240 */
43a951e9 241struct ip_ra_chain __rcu *ip_ra_chain;
66018506
ED		 242static DEFINE_SPINLOCK(ip_ra_lock);
243
592fcb9d
ED		 244
245static void ip_ra_destroy_rcu(struct rcu_head *head)
66018506 246{
592fcb9d
ED		 247 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
248
249 sock_put(ra->saved_sk);
250 kfree(ra);
66018506 251}
1da177e4 252
4d52cfbe
ED		 253int ip_ra_control(struct sock *sk, unsigned char on,
254 void (*destructor)(struct sock *))
1da177e4 255{
43a951e9
ED		 256 struct ip_ra_chain *ra, *new_ra;
257 struct ip_ra_chain __rcu **rap;
1da177e4 258
c720c7e8 259 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
1da177e4
LT		 260 return -EINVAL;
261
262 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
263
66018506 264 spin_lock_bh(&ip_ra_lock);
43a951e9
ED		 265 for (rap = &ip_ra_chain;
266 (ra = rcu_dereference_protected(*rap,
267 lockdep_is_held(&ip_ra_lock))) != NULL;
268 rap = &ra->next) {
1da177e4
LT		 269 if (ra->sk == sk) {
270 if (on) {
66018506 271 spin_unlock_bh(&ip_ra_lock);
a51482bd 272 kfree(new_ra);
1da177e4
LT		 273 return -EADDRINUSE;
274 }
592fcb9d
ED		 275 /* dont let ip_call_ra_chain() use sk again */
276 ra->sk = NULL;
66018506
ED		 277 rcu_assign_pointer(*rap, ra->next);
278 spin_unlock_bh(&ip_ra_lock);
1da177e4
LT		 279
280 if (ra->destructor)
281 ra->destructor(sk);
592fcb9d
ED		 282 /*
283 * Delay sock_put(sk) and kfree(ra) after one rcu grace
284 * period. This guarantee ip_call_ra_chain() dont need
285 * to mess with socket refcounts.
286 */
287 ra->saved_sk = sk;
288 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
1da177e4
LT		 289 return 0;
290 }
291 }
292 if (new_ra == NULL) {
66018506 293 spin_unlock_bh(&ip_ra_lock);
1da177e4
LT		 294 return -ENOBUFS;
295 }
296 new_ra->sk = sk;
297 new_ra->destructor = destructor;
298
299 new_ra->next = ra;
66018506 300 rcu_assign_pointer(*rap, new_ra);
1da177e4 301 sock_hold(sk);
66018506 302 spin_unlock_bh(&ip_ra_lock);
1da177e4
LT		 303
304 return 0;
305}
306
e905a9ed 307void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
35986b32 308 __be16 port, u32 info, u8 *payload)
1da177e4 309{
1da177e4
LT		 310 struct sock_exterr_skb *serr;
311
1da177e4
LT		 312 skb = skb_clone(skb, GFP_ATOMIC);
313 if (!skb)
314 return;
315
e905a9ed 316 serr = SKB_EXT_ERR(skb);
1da177e4
LT		 317 serr->ee.ee_errno = err;
318 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
88c7664f
ACM		 319 serr->ee.ee_type = icmp_hdr(skb)->type;
320 serr->ee.ee_code = icmp_hdr(skb)->code;
1da177e4
LT		 321 serr->ee.ee_pad = 0;
322 serr->ee.ee_info = info;
323 serr->ee.ee_data = 0;
88c7664f 324 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
d56f90a7 325 skb_network_header(skb);
1da177e4
LT		 326 serr->port = port;
327
bd82393c
ACM		 328 if (skb_pull(skb, payload - skb->data) != NULL) {
329 skb_reset_transport_header(skb);
330 if (sock_queue_err_skb(sk, skb) == 0)
331 return;
332 }
333 kfree_skb(skb);
1da177e4
LT		 334}
335
0579016e 336void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
1da177e4
LT		 337{
338 struct inet_sock *inet = inet_sk(sk);
339 struct sock_exterr_skb *serr;
340 struct iphdr *iph;
341 struct sk_buff *skb;
342
343 if (!inet->recverr)
344 return;
345
346 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
347 if (!skb)
348 return;
349
2ca9e6f2
ACM		 350 skb_put(skb, sizeof(struct iphdr));
351 skb_reset_network_header(skb);
eddc9ec5 352 iph = ip_hdr(skb);
1da177e4
LT		 353 iph->daddr = daddr;
354
e905a9ed 355 serr = SKB_EXT_ERR(skb);
1da177e4
LT		 356 serr->ee.ee_errno = err;
357 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
e905a9ed 358 serr->ee.ee_type = 0;
1da177e4
LT		 359 serr->ee.ee_code = 0;
360 serr->ee.ee_pad = 0;
361 serr->ee.ee_info = info;
362 serr->ee.ee_data = 0;
d56f90a7 363 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
1da177e4
LT		 364 serr->port = port;
365
27a884dc 366 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
bd82393c 367 skb_reset_transport_header(skb);
1da177e4
LT		 368
369 if (sock_queue_err_skb(sk, skb))
370 kfree_skb(skb);
371}
372
e905a9ed 373/*
1da177e4
LT		 374 * Handle MSG_ERRQUEUE
375 */
376int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
377{
378 struct sock_exterr_skb *serr;
379 struct sk_buff *skb, *skb2;
380 struct sockaddr_in *sin;
381 struct {
382 struct sock_extended_err ee;
383 struct sockaddr_in offender;
384 } errhdr;
385 int err;
386 int copied;
387
388 err = -EAGAIN;
389 skb = skb_dequeue(&sk->sk_error_queue);
390 if (skb == NULL)
391 goto out;
392
393 copied = skb->len;
394 if (copied > len) {
395 msg->msg_flags |= MSG_TRUNC;
396 copied = len;
397 }
398 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
399 if (err)
400 goto out_free_skb;
401
402 sock_recv_timestamp(msg, sk, skb);
403
404 serr = SKB_EXT_ERR(skb);
405
406 sin = (struct sockaddr_in *)msg->msg_name;
407 if (sin) {
408 sin->sin_family = AF_INET;
d56f90a7
ACM		 409 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
410 serr->addr_offset);
1da177e4
LT		 411 sin->sin_port = serr->port;
412 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
413 }
414
415 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
416 sin = &errhdr.offender;
417 sin->sin_family = AF_UNSPEC;
418 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
419 struct inet_sock *inet = inet_sk(sk);
420
421 sin->sin_family = AF_INET;
eddc9ec5 422 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
1da177e4
LT		 423 sin->sin_port = 0;
424 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
425 if (inet->cmsg_flags)
426 ip_cmsg_recv(msg, skb);
427 }
428
429 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
430
431 /* Now we could try to dump offended packet options */
432
433 msg->msg_flags |= MSG_ERRQUEUE;
434 err = copied;
435
436 /* Reset and regenerate socket error */
e0f9f858 437 spin_lock_bh(&sk->sk_error_queue.lock);
1da177e4 438 sk->sk_err = 0;
4d52cfbe
ED		 439 skb2 = skb_peek(&sk->sk_error_queue);
440 if (skb2 != NULL) {
1da177e4 441 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
e0f9f858 442 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 443 sk->sk_error_report(sk);
444 } else
e0f9f858 445 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4 446
e905a9ed 447out_free_skb:
1da177e4
LT		 448 kfree_skb(skb);
449out:
450 return err;
451}
452
453
f6d8bd05
ED		 454static void opt_kfree_rcu(struct rcu_head *head)
455{
456 kfree(container_of(head, struct ip_options_rcu, rcu));
457}
458
1da177e4 459/*
4d52cfbe
ED		 460 * Socket option code for IP. This is the end of the line after any
461 * TCP,UDP etc options on an IP socket.
1da177e4
LT		 462 */
463
3fdadf7d 464static int do_ip_setsockopt(struct sock *sk, int level,
b7058842 465 int optname, char __user *optval, unsigned int optlen)
1da177e4
LT		 466{
467 struct inet_sock *inet = inet_sk(sk);
09cb105e 468 int val = 0, err;
1da177e4 469
e905a9ed 470 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
132adf54
SH		 471 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
472 (1<<IP_RETOPTS) | (1<<IP_TOS) |
473 (1<<IP_TTL) | (1<<IP_HDRINCL) |
474 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
475 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
d218d111 476 (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) |
7b2ff18e 477 (1<<IP_MINTTL) | (1<<IP_NODEFRAG))) ||
132adf54 478 optname == IP_MULTICAST_TTL ||
f771bef9 479 optname == IP_MULTICAST_ALL ||
e8b2dfe9
BS		 480 optname == IP_MULTICAST_LOOP ||
481 optname == IP_RECVORIGDSTADDR) {
1da177e4
LT		 482 if (optlen >= sizeof(int)) {
483 if (get_user(val, (int __user *) optval))
484 return -EFAULT;
485 } else if (optlen >= sizeof(char)) {
486 unsigned char ucval;
487
488 if (get_user(ucval, (unsigned char __user *) optval))
489 return -EFAULT;
490 val = (int) ucval;
491 }
492 }
493
494 /* If optlen==0, it is equivalent to val == 0 */
495
6a9fb947 496 if (ip_mroute_opt(optname))
09cb105e 497 return ip_mroute_setsockopt(sk, optname, optval, optlen);
1da177e4
LT		 498
499 err = 0;
500 lock_sock(sk);
501
502 switch (optname) {
132adf54
SH		 503 case IP_OPTIONS:
504 {
f6d8bd05
ED		 505 struct ip_options_rcu *old, *opt = NULL;
506
65a1c4ff 507 if (optlen > 40)
132adf54 508 goto e_inval;
3b1e0a65 509 err = ip_options_get_from_user(sock_net(sk), &opt,
cb84663e 510 optval, optlen);
132adf54
SH		 511 if (err)
512 break;
f6d8bd05
ED		 513 old = rcu_dereference_protected(inet->inet_opt,
514 sock_owned_by_user(sk));
132adf54
SH		 515 if (inet->is_icsk) {
516 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4 517#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
132adf54
SH		 518 if (sk->sk_family == PF_INET ||
519 (!((1 << sk->sk_state) &
520 (TCPF_LISTEN | TCPF_CLOSE)) &&
c720c7e8 521 inet->inet_daddr != LOOPBACK4_IPV6)) {
1da177e4 522#endif
f6d8bd05
ED		 523 if (old)
524 icsk->icsk_ext_hdr_len -= old->opt.optlen;
132adf54 525 if (opt)
f6d8bd05 526 icsk->icsk_ext_hdr_len += opt->opt.optlen;
132adf54 527 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
1da177e4 528#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1da177e4 529 }
132adf54 530#endif
1da177e4 531 }
f6d8bd05
ED		 532 rcu_assign_pointer(inet->inet_opt, opt);
533 if (old)
534 call_rcu(&old->rcu, opt_kfree_rcu);
132adf54
SH		 535 break;
536 }
537 case IP_PKTINFO:
538 if (val)
539 inet->cmsg_flags |= IP_CMSG_PKTINFO;
540 else
541 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
542 break;
543 case IP_RECVTTL:
544 if (val)
545 inet->cmsg_flags |= IP_CMSG_TTL;
546 else
547 inet->cmsg_flags &= ~IP_CMSG_TTL;
548 break;
549 case IP_RECVTOS:
550 if (val)
551 inet->cmsg_flags |= IP_CMSG_TOS;
552 else
553 inet->cmsg_flags &= ~IP_CMSG_TOS;
554 break;
555 case IP_RECVOPTS:
556 if (val)
557 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
558 else
559 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
560 break;
561 case IP_RETOPTS:
562 if (val)
563 inet->cmsg_flags |= IP_CMSG_RETOPTS;
564 else
565 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
566 break;
567 case IP_PASSSEC:
568 if (val)
569 inet->cmsg_flags |= IP_CMSG_PASSSEC;
570 else
571 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
572 break;
e8b2dfe9
BS		 573 case IP_RECVORIGDSTADDR:
574 if (val)
575 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
576 else
577 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
578 break;
132adf54
SH		 579 case IP_TOS: /* This sets both TOS and Precedence */
580 if (sk->sk_type == SOCK_STREAM) {
581 val &= ~3;
582 val |= inet->tos & 3;
583 }
132adf54
SH		 584 if (inet->tos != val) {
585 inet->tos = val;
586 sk->sk_priority = rt_tos2priority(val);
587 sk_dst_reset(sk);
588 }
589 break;
590 case IP_TTL:
4d52cfbe 591 if (optlen < 1)
132adf54 592 goto e_inval;
4d52cfbe 593 if (val != -1 && (val < 0 || val > 255))
132adf54
SH		 594 goto e_inval;
595 inet->uc_ttl = val;
596 break;
597 case IP_HDRINCL:
598 if (sk->sk_type != SOCK_RAW) {
599 err = -ENOPROTOOPT;
2c7946a7 600 break;
132adf54
SH		 601 }
602 inet->hdrincl = val ? 1 : 0;
603 break;
7b2ff18e
JO		 604 case IP_NODEFRAG:
605 if (sk->sk_type != SOCK_RAW) {
606 err = -ENOPROTOOPT;
607 break;
608 }
609 inet->nodefrag = val ? 1 : 0;
610 break;
132adf54 611 case IP_MTU_DISCOVER:
0eae750e 612 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
132adf54
SH		 613 goto e_inval;
614 inet->pmtudisc = val;
615 break;
616 case IP_RECVERR:
617 inet->recverr = !!val;
618 if (!val)
619 skb_queue_purge(&sk->sk_error_queue);
620 break;
621 case IP_MULTICAST_TTL:
622 if (sk->sk_type == SOCK_STREAM)
623 goto e_inval;
4d52cfbe 624 if (optlen < 1)
132adf54 625 goto e_inval;
09cb105e 626 if (val == -1)
132adf54
SH		 627 val = 1;
628 if (val < 0 || val > 255)
629 goto e_inval;
630 inet->mc_ttl = val;
631 break;
632 case IP_MULTICAST_LOOP:
4d52cfbe 633 if (optlen < 1)
132adf54
SH		 634 goto e_inval;
635 inet->mc_loop = !!val;
636 break;
637 case IP_MULTICAST_IF:
638 {
639 struct ip_mreqn mreq;
640 struct net_device *dev = NULL;
641
642 if (sk->sk_type == SOCK_STREAM)
643 goto e_inval;
644 /*
645 * Check the arguments are allowable
646 */
647
0915921b
SW		 648 if (optlen < sizeof(struct in_addr))
649 goto e_inval;
650
132adf54
SH		 651 err = -EFAULT;
652 if (optlen >= sizeof(struct ip_mreqn)) {
09cb105e 653 if (copy_from_user(&mreq, optval, sizeof(mreq)))
1da177e4 654 break;
132adf54
SH		 655 } else {
656 memset(&mreq, 0, sizeof(mreq));
657 if (optlen >= sizeof(struct in_addr) &&
4d52cfbe
ED		 658 copy_from_user(&mreq.imr_address, optval,
659 sizeof(struct in_addr)))
132adf54
SH		 660 break;
661 }
662
663 if (!mreq.imr_ifindex) {
e6f1cebf 664 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
132adf54
SH		 665 inet->mc_index = 0;
666 inet->mc_addr = 0;
667 err = 0;
1da177e4
LT		 668 break;
669 }
3b1e0a65 670 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
55b80503 671 if (dev)
132adf54 672 mreq.imr_ifindex = dev->ifindex;
132adf54 673 } else
55b80503 674 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
1da177e4 675
1da177e4 676
132adf54
SH		 677 err = -EADDRNOTAVAIL;
678 if (!dev)
679 break;
55b80503 680 dev_put(dev);
132adf54
SH		 681
682 err = -EINVAL;
683 if (sk->sk_bound_dev_if &&
684 mreq.imr_ifindex != sk->sk_bound_dev_if)
685 break;
1da177e4 686
132adf54
SH		 687 inet->mc_index = mreq.imr_ifindex;
688 inet->mc_addr = mreq.imr_address.s_addr;
689 err = 0;
690 break;
691 }
1da177e4 692
132adf54
SH		 693 case IP_ADD_MEMBERSHIP:
694 case IP_DROP_MEMBERSHIP:
695 {
696 struct ip_mreqn mreq;
1da177e4 697
a96fb49b
FL		 698 err = -EPROTO;
699 if (inet_sk(sk)->is_icsk)
700 break;
701
132adf54
SH		 702 if (optlen < sizeof(struct ip_mreq))
703 goto e_inval;
704 err = -EFAULT;
705 if (optlen >= sizeof(struct ip_mreqn)) {
09cb105e 706 if (copy_from_user(&mreq, optval, sizeof(mreq)))
1da177e4 707 break;
132adf54
SH		 708 } else {
709 memset(&mreq, 0, sizeof(mreq));
09cb105e 710 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
1da177e4 711 break;
132adf54 712 }
1da177e4 713
132adf54
SH		 714 if (optname == IP_ADD_MEMBERSHIP)
715 err = ip_mc_join_group(sk, &mreq);
716 else
717 err = ip_mc_leave_group(sk, &mreq);
718 break;
719 }
720 case IP_MSFILTER:
721 {
132adf54
SH		 722 struct ip_msfilter *msf;
723
724 if (optlen < IP_MSFILTER_SIZE(0))
725 goto e_inval;
726 if (optlen > sysctl_optmem_max) {
727 err = -ENOBUFS;
1da177e4
LT		 728 break;
729 }
132adf54 730 msf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 731 if (!msf) {
132adf54
SH		 732 err = -ENOBUFS;
733 break;
734 }
735 err = -EFAULT;
736 if (copy_from_user(msf, optval, optlen)) {
737 kfree(msf);
738 break;
739 }
740 /* numsrc >= (1G-4) overflow in 32 bits */
741 if (msf->imsf_numsrc >= 0x3ffffffcU ||
742 msf->imsf_numsrc > sysctl_igmp_max_msf) {
743 kfree(msf);
744 err = -ENOBUFS;
745 break;
746 }
747 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
748 kfree(msf);
749 err = -EINVAL;
750 break;
751 }
752 err = ip_mc_msfilter(sk, msf, 0);
753 kfree(msf);
754 break;
755 }
756 case IP_BLOCK_SOURCE:
757 case IP_UNBLOCK_SOURCE:
758 case IP_ADD_SOURCE_MEMBERSHIP:
759 case IP_DROP_SOURCE_MEMBERSHIP:
760 {
761 struct ip_mreq_source mreqs;
762 int omode, add;
1da177e4 763
132adf54
SH		 764 if (optlen != sizeof(struct ip_mreq_source))
765 goto e_inval;
766 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
1da177e4 767 err = -EFAULT;
1da177e4
LT		 768 break;
769 }
132adf54
SH		 770 if (optname == IP_BLOCK_SOURCE) {
771 omode = MCAST_EXCLUDE;
772 add = 1;
773 } else if (optname == IP_UNBLOCK_SOURCE) {
774 omode = MCAST_EXCLUDE;
775 add = 0;
776 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
777 struct ip_mreqn mreq;
1da177e4 778
132adf54
SH		 779 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
780 mreq.imr_address.s_addr = mreqs.imr_interface;
781 mreq.imr_ifindex = 0;
782 err = ip_mc_join_group(sk, &mreq);
783 if (err && err != -EADDRINUSE)
1da177e4 784 break;
132adf54
SH		 785 omode = MCAST_INCLUDE;
786 add = 1;
787 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
788 omode = MCAST_INCLUDE;
789 add = 0;
790 }
791 err = ip_mc_source(add, omode, sk, &mreqs, 0);
792 break;
793 }
794 case MCAST_JOIN_GROUP:
795 case MCAST_LEAVE_GROUP:
796 {
797 struct group_req greq;
798 struct sockaddr_in *psin;
799 struct ip_mreqn mreq;
800
801 if (optlen < sizeof(struct group_req))
802 goto e_inval;
803 err = -EFAULT;
804 if (copy_from_user(&greq, optval, sizeof(greq)))
805 break;
806 psin = (struct sockaddr_in *)&greq.gr_group;
807 if (psin->sin_family != AF_INET)
808 goto e_inval;
809 memset(&mreq, 0, sizeof(mreq));
810 mreq.imr_multiaddr = psin->sin_addr;
811 mreq.imr_ifindex = greq.gr_interface;
812
813 if (optname == MCAST_JOIN_GROUP)
814 err = ip_mc_join_group(sk, &mreq);
815 else
816 err = ip_mc_leave_group(sk, &mreq);
817 break;
818 }
819 case MCAST_JOIN_SOURCE_GROUP:
820 case MCAST_LEAVE_SOURCE_GROUP:
821 case MCAST_BLOCK_SOURCE:
822 case MCAST_UNBLOCK_SOURCE:
823 {
824 struct group_source_req greqs;
825 struct ip_mreq_source mreqs;
826 struct sockaddr_in *psin;
827 int omode, add;
828
829 if (optlen != sizeof(struct group_source_req))
830 goto e_inval;
831 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1da177e4 832 err = -EFAULT;
1da177e4
LT		 833 break;
834 }
132adf54
SH		 835 if (greqs.gsr_group.ss_family != AF_INET ||
836 greqs.gsr_source.ss_family != AF_INET) {
837 err = -EADDRNOTAVAIL;
1da177e4
LT		 838 break;
839 }
132adf54
SH		 840 psin = (struct sockaddr_in *)&greqs.gsr_group;
841 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
842 psin = (struct sockaddr_in *)&greqs.gsr_source;
843 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
844 mreqs.imr_interface = 0; /* use index for mc_source */
845
846 if (optname == MCAST_BLOCK_SOURCE) {
847 omode = MCAST_EXCLUDE;
848 add = 1;
849 } else if (optname == MCAST_UNBLOCK_SOURCE) {
850 omode = MCAST_EXCLUDE;
851 add = 0;
852 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1da177e4
LT		 853 struct ip_mreqn mreq;
854
132adf54 855 psin = (struct sockaddr_in *)&greqs.gsr_group;
1da177e4 856 mreq.imr_multiaddr = psin->sin_addr;
132adf54
SH		 857 mreq.imr_address.s_addr = 0;
858 mreq.imr_ifindex = greqs.gsr_interface;
859 err = ip_mc_join_group(sk, &mreq);
860 if (err && err != -EADDRINUSE)
861 break;
862 greqs.gsr_interface = mreq.imr_ifindex;
863 omode = MCAST_INCLUDE;
864 add = 1;
865 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
866 omode = MCAST_INCLUDE;
867 add = 0;
868 }
869 err = ip_mc_source(add, omode, sk, &mreqs,
870 greqs.gsr_interface);
871 break;
872 }
873 case MCAST_MSFILTER:
874 {
132adf54
SH		 875 struct sockaddr_in *psin;
876 struct ip_msfilter *msf = NULL;
877 struct group_filter *gsf = NULL;
878 int msize, i, ifindex;
879
880 if (optlen < GROUP_FILTER_SIZE(0))
881 goto e_inval;
882 if (optlen > sysctl_optmem_max) {
883 err = -ENOBUFS;
1da177e4
LT		 884 break;
885 }
09cb105e 886 gsf = kmalloc(optlen, GFP_KERNEL);
cfcabdcc 887 if (!gsf) {
132adf54 888 err = -ENOBUFS;
1da177e4
LT		 889 break;
890 }
132adf54 891 err = -EFAULT;
4d52cfbe 892 if (copy_from_user(gsf, optval, optlen))
132adf54 893 goto mc_msf_out;
4d52cfbe 894
132adf54
SH		 895 /* numsrc >= (4G-140)/128 overflow in 32 bits */
896 if (gsf->gf_numsrc >= 0x1ffffff ||
897 gsf->gf_numsrc > sysctl_igmp_max_msf) {
898 err = -ENOBUFS;
899 goto mc_msf_out;
900 }
901 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
902 err = -EINVAL;
903 goto mc_msf_out;
904 }
905 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
09cb105e 906 msf = kmalloc(msize, GFP_KERNEL);
cfcabdcc 907 if (!msf) {
132adf54
SH		 908 err = -ENOBUFS;
909 goto mc_msf_out;
910 }
911 ifindex = gsf->gf_interface;
912 psin = (struct sockaddr_in *)&gsf->gf_group;
913 if (psin->sin_family != AF_INET) {
1da177e4 914 err = -EADDRNOTAVAIL;
132adf54 915 goto mc_msf_out;
1da177e4 916 }
132adf54
SH		 917 msf->imsf_multiaddr = psin->sin_addr.s_addr;
918 msf->imsf_interface = 0;
919 msf->imsf_fmode = gsf->gf_fmode;
920 msf->imsf_numsrc = gsf->gf_numsrc;
921 err = -EADDRNOTAVAIL;
4d52cfbe 922 for (i = 0; i < gsf->gf_numsrc; ++i) {
132adf54 923 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
e905a9ed 924
132adf54
SH		 925 if (psin->sin_family != AF_INET)
926 goto mc_msf_out;
927 msf->imsf_slist[i] = psin->sin_addr.s_addr;
928 }
929 kfree(gsf);
930 gsf = NULL;
931
932 err = ip_mc_msfilter(sk, msf, ifindex);
4d52cfbe 933mc_msf_out:
132adf54
SH		 934 kfree(msf);
935 kfree(gsf);
936 break;
937 }
f771bef9
NS		 938 case IP_MULTICAST_ALL:
939 if (optlen < 1)
940 goto e_inval;
941 if (val != 0 && val != 1)
942 goto e_inval;
943 inet->mc_all = val;
944 break;
132adf54
SH		 945 case IP_ROUTER_ALERT:
946 err = ip_ra_control(sk, val ? 1 : 0, NULL);
947 break;
948
949 case IP_FREEBIND:
4d52cfbe 950 if (optlen < 1)
132adf54
SH		 951 goto e_inval;
952 inet->freebind = !!val;
953 break;
954
955 case IP_IPSEC_POLICY:
956 case IP_XFRM_POLICY:
957 err = -EPERM;
958 if (!capable(CAP_NET_ADMIN))
1da177e4 959 break;
132adf54
SH		 960 err = xfrm_user_policy(sk, optname, optval, optlen);
961 break;
1da177e4 962
f5715aea 963 case IP_TRANSPARENT:
6cc7a765 964 if (!!val && !capable(CAP_NET_RAW) && !capable(CAP_NET_ADMIN)) {
f5715aea
KK		 965 err = -EPERM;
966 break;
967 }
968 if (optlen < 1)
969 goto e_inval;
970 inet->transparent = !!val;
971 break;
972
d218d111
SH		 973 case IP_MINTTL:
974 if (optlen < 1)
975 goto e_inval;
976 if (val < 0 || val > 255)
977 goto e_inval;
978 inet->min_ttl = val;
979 break;
980
132adf54
SH		 981 default:
982 err = -ENOPROTOOPT;
983 break;
1da177e4
LT		 984 }
985 release_sock(sk);
986 return err;
987
988e_inval:
989 release_sock(sk);
990 return -EINVAL;
991}
992
f84af32c
ED		 993/**
994 * ip_queue_rcv_skb - Queue an skb into sock receive queue
995 * @sk: socket
996 * @skb: buffer
997 *
998 * Queues an skb into socket receive queue. If IP_CMSG_PKTINFO option
999 * is not set, we drop skb dst entry now, while dst cache line is hot.
1000 */
1001int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
1002{
1003 if (!(inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO))
1004 skb_dst_drop(skb);
1005 return sock_queue_rcv_skb(sk, skb);
1006}
1007EXPORT_SYMBOL(ip_queue_rcv_skb);
1008
3fdadf7d 1009int ip_setsockopt(struct sock *sk, int level,
b7058842 1010 int optname, char __user *optval, unsigned int optlen)
3fdadf7d
DM		 1011{
1012 int err;
1013
1014 if (level != SOL_IP)
1015 return -ENOPROTOOPT;
1016
1017 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1018#ifdef CONFIG_NETFILTER
1019 /* we need to exclude all possible ENOPROTOOPTs except default case */
1020 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 1021 optname != IP_IPSEC_POLICY &&
1022 optname != IP_XFRM_POLICY &&
1023 !ip_mroute_opt(optname)) {
3fdadf7d
DM		 1024 lock_sock(sk);
1025 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1026 release_sock(sk);
1027 }
1028#endif
1029 return err;
1030}
4d52cfbe 1031EXPORT_SYMBOL(ip_setsockopt);
3fdadf7d
DM		 1032
1033#ifdef CONFIG_COMPAT
543d9cfe 1034int compat_ip_setsockopt(struct sock *sk, int level, int optname,
b7058842 1035 char __user *optval, unsigned int optlen)
3fdadf7d
DM		 1036{
1037 int err;
1038
1039 if (level != SOL_IP)
1040 return -ENOPROTOOPT;
1041
dae50295
DS		 1042 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1043 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1044 ip_setsockopt);
1045
3fdadf7d
DM		 1046 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1047#ifdef CONFIG_NETFILTER
1048 /* we need to exclude all possible ENOPROTOOPTs except default case */
1049 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
6a9fb947
PE		 1050 optname != IP_IPSEC_POLICY &&
1051 optname != IP_XFRM_POLICY &&
1052 !ip_mroute_opt(optname)) {
3fdadf7d 1053 lock_sock(sk);
543d9cfe
ACM		 1054 err = compat_nf_setsockopt(sk, PF_INET, optname,
1055 optval, optlen);
3fdadf7d
DM		 1056 release_sock(sk);
1057 }
1058#endif
1059 return err;
1060}
543d9cfe 1061EXPORT_SYMBOL(compat_ip_setsockopt);
3fdadf7d
DM		 1062#endif
1063
1da177e4 1064/*
4d52cfbe
ED		 1065 * Get the options. Note for future reference. The GET of IP options gets
1066 * the _received_ ones. The set sets the _sent_ ones.
1da177e4
LT		 1067 */
1068
3fdadf7d 1069static int do_ip_getsockopt(struct sock *sk, int level, int optname,
dd23198e 1070 char __user *optval, int __user *optlen, unsigned flags)
1da177e4
LT		 1071{
1072 struct inet_sock *inet = inet_sk(sk);
1073 int val;
1074 int len;
e905a9ed 1075
132adf54 1076 if (level != SOL_IP)
1da177e4
LT		 1077 return -EOPNOTSUPP;
1078
6a9fb947 1079 if (ip_mroute_opt(optname))
09cb105e 1080 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1da177e4 1081
09cb105e 1082 if (get_user(len, optlen))
1da177e4 1083 return -EFAULT;
132adf54 1084 if (len < 0)
1da177e4 1085 return -EINVAL;
e905a9ed 1086
1da177e4
LT		 1087 lock_sock(sk);
1088
132adf54
SH		 1089 switch (optname) {
1090 case IP_OPTIONS:
1091 {
1092 unsigned char optbuf[sizeof(struct ip_options)+40];
f6d8bd05
ED		 1093 struct ip_options *opt = (struct ip_options *)optbuf;
1094 struct ip_options_rcu *inet_opt;
1095
1096 inet_opt = rcu_dereference_protected(inet->inet_opt,
1097 sock_owned_by_user(sk));
132adf54 1098 opt->optlen = 0;
f6d8bd05
ED		 1099 if (inet_opt)
1100 memcpy(optbuf, &inet_opt->opt,
1101 sizeof(struct ip_options) +
1102 inet_opt->opt.optlen);
132adf54
SH		 1103 release_sock(sk);
1104
1105 if (opt->optlen == 0)
1106 return put_user(0, optlen);
1107
1108 ip_options_undo(opt);
1109
1110 len = min_t(unsigned int, len, opt->optlen);
1111 if (put_user(len, optlen))
1112 return -EFAULT;
1113 if (copy_to_user(optval, opt->__data, len))
1114 return -EFAULT;
1115 return 0;
1116 }
1117 case IP_PKTINFO:
1118 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1119 break;
1120 case IP_RECVTTL:
1121 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1122 break;
1123 case IP_RECVTOS:
1124 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1125 break;
1126 case IP_RECVOPTS:
1127 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1128 break;
1129 case IP_RETOPTS:
1130 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1131 break;
1132 case IP_PASSSEC:
1133 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1134 break;
e8b2dfe9
BS		 1135 case IP_RECVORIGDSTADDR:
1136 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1137 break;
132adf54
SH		 1138 case IP_TOS:
1139 val = inet->tos;
1140 break;
1141 case IP_TTL:
1142 val = (inet->uc_ttl == -1 ?
1143 sysctl_ip_default_ttl :
1144 inet->uc_ttl);
1145 break;
1146 case IP_HDRINCL:
1147 val = inet->hdrincl;
1148 break;
a89b4763
MK		 1149 case IP_NODEFRAG:
1150 val = inet->nodefrag;
1151 break;
132adf54
SH		 1152 case IP_MTU_DISCOVER:
1153 val = inet->pmtudisc;
1154 break;
1155 case IP_MTU:
1156 {
1157 struct dst_entry *dst;
1158 val = 0;
1159 dst = sk_dst_get(sk);
1160 if (dst) {
1161 val = dst_mtu(dst);
1162 dst_release(dst);
1da177e4 1163 }
132adf54 1164 if (!val) {
1da177e4 1165 release_sock(sk);
132adf54 1166 return -ENOTCONN;
1da177e4 1167 }
132adf54
SH		 1168 break;
1169 }
1170 case IP_RECVERR:
1171 val = inet->recverr;
1172 break;
1173 case IP_MULTICAST_TTL:
1174 val = inet->mc_ttl;
1175 break;
1176 case IP_MULTICAST_LOOP:
1177 val = inet->mc_loop;
1178 break;
1179 case IP_MULTICAST_IF:
1180 {
1181 struct in_addr addr;
1182 len = min_t(unsigned int, len, sizeof(struct in_addr));
1183 addr.s_addr = inet->mc_addr;
1184 release_sock(sk);
1da177e4 1185
132adf54
SH		 1186 if (put_user(len, optlen))
1187 return -EFAULT;
1188 if (copy_to_user(optval, &addr, len))
1189 return -EFAULT;
1190 return 0;
1191 }
1192 case IP_MSFILTER:
1193 {
1194 struct ip_msfilter msf;
1195 int err;
1196
1197 if (len < IP_MSFILTER_SIZE(0)) {
1da177e4 1198 release_sock(sk);
132adf54 1199 return -EINVAL;
1da177e4 1200 }
132adf54 1201 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1da177e4 1202 release_sock(sk);
132adf54 1203 return -EFAULT;
1da177e4 1204 }
132adf54
SH		 1205 err = ip_mc_msfget(sk, &msf,
1206 (struct ip_msfilter __user *)optval, optlen);
1207 release_sock(sk);
1208 return err;
1209 }
1210 case MCAST_MSFILTER:
1211 {
1212 struct group_filter gsf;
1213 int err;
1da177e4 1214
132adf54 1215 if (len < GROUP_FILTER_SIZE(0)) {
1da177e4 1216 release_sock(sk);
132adf54
SH		 1217 return -EINVAL;
1218 }
1219 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1220 release_sock(sk);
1221 return -EFAULT;
1222 }
1223 err = ip_mc_gsfget(sk, &gsf,
4d52cfbe
ED		 1224 (struct group_filter __user *)optval,
1225 optlen);
132adf54
SH		 1226 release_sock(sk);
1227 return err;
1228 }
f771bef9
NS		 1229 case IP_MULTICAST_ALL:
1230 val = inet->mc_all;
1231 break;
132adf54
SH		 1232 case IP_PKTOPTIONS:
1233 {
1234 struct msghdr msg;
1da177e4 1235
132adf54 1236 release_sock(sk);
1da177e4 1237
132adf54
SH		 1238 if (sk->sk_type != SOCK_STREAM)
1239 return -ENOPROTOOPT;
1da177e4 1240
132adf54
SH		 1241 msg.msg_control = optval;
1242 msg.msg_controllen = len;
dd23198e 1243 msg.msg_flags = flags;
1da177e4 1244
132adf54
SH		 1245 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1246 struct in_pktinfo info;
1247
c720c7e8
ED		 1248 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1249 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
132adf54
SH		 1250 info.ipi_ifindex = inet->mc_index;
1251 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1da177e4 1252 }
132adf54
SH		 1253 if (inet->cmsg_flags & IP_CMSG_TTL) {
1254 int hlim = inet->mc_ttl;
1255 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1256 }
1257 len -= msg.msg_controllen;
1258 return put_user(len, optlen);
1259 }
1260 case IP_FREEBIND:
1261 val = inet->freebind;
1262 break;
f5715aea
KK		 1263 case IP_TRANSPARENT:
1264 val = inet->transparent;
1265 break;
d218d111
SH		 1266 case IP_MINTTL:
1267 val = inet->min_ttl;
1268 break;
132adf54
SH		 1269 default:
1270 release_sock(sk);
1271 return -ENOPROTOOPT;
1da177e4
LT		 1272 }
1273 release_sock(sk);
e905a9ed 1274
4d52cfbe 1275 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1da177e4
LT		 1276 unsigned char ucval = (unsigned char)val;
1277 len = 1;
132adf54 1278 if (put_user(len, optlen))
1da177e4 1279 return -EFAULT;
09cb105e 1280 if (copy_to_user(optval, &ucval, 1))
1da177e4
LT		 1281 return -EFAULT;
1282 } else {
1283 len = min_t(unsigned int, sizeof(int), len);
132adf54 1284 if (put_user(len, optlen))
1da177e4 1285 return -EFAULT;
09cb105e 1286 if (copy_to_user(optval, &val, len))
1da177e4
LT		 1287 return -EFAULT;
1288 }
1289 return 0;
1290}
1291
3fdadf7d 1292int ip_getsockopt(struct sock *sk, int level,
132adf54 1293 int optname, char __user *optval, int __user *optlen)
3fdadf7d
DM		 1294{
1295 int err;
1296
dd23198e 1297 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
3fdadf7d
DM		 1298#ifdef CONFIG_NETFILTER
1299 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1300 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1301 !ip_mroute_opt(optname)) {
e905a9ed 1302 int len;
3fdadf7d 1303
09cb105e 1304 if (get_user(len, optlen))
3fdadf7d
DM		 1305 return -EFAULT;
1306
1307 lock_sock(sk);
1308 err = nf_getsockopt(sk, PF_INET, optname, optval,
1309 &len);
1310 release_sock(sk);
1311 if (err >= 0)
1312 err = put_user(len, optlen);
1313 return err;
1314 }
1315#endif
1316 return err;
1317}
4d52cfbe 1318EXPORT_SYMBOL(ip_getsockopt);
3fdadf7d
DM		 1319
1320#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1321int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1322 char __user *optval, int __user *optlen)
3fdadf7d 1323{
42908c69
DS		 1324 int err;
1325
1326 if (optname == MCAST_MSFILTER)
1327 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1328 ip_getsockopt);
1329
dd23198e
DB		 1330 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1331 MSG_CMSG_COMPAT);
42908c69 1332
3fdadf7d
DM		 1333#ifdef CONFIG_NETFILTER
1334 /* we need to exclude all possible ENOPROTOOPTs except default case */
6a9fb947
PE		 1335 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1336 !ip_mroute_opt(optname)) {
e905a9ed 1337 int len;
3fdadf7d 1338
543d9cfe 1339 if (get_user(len, optlen))
3fdadf7d
DM		 1340 return -EFAULT;
1341
1342 lock_sock(sk);
543d9cfe 1343 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
3fdadf7d
DM		 1344 release_sock(sk);
1345 if (err >= 0)
1346 err = put_user(len, optlen);
1347 return err;
1348 }
1349#endif
1350 return err;
1351}
543d9cfe 1352EXPORT_SYMBOL(compat_ip_getsockopt);
3fdadf7d 1353#endif
Linux 6.x block layer and io_uring tree(s)